Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o nome do candidato em que o titular se chama James P. Buchanan?
 ###Tabelas: CREATE TABLE  (_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Result VARCHAR, Candidates VARCHAR) CREATE TABLE singles:_15_8_titles_7_runner–ups (singles:_15_8_titles_7_runner–ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE champions_by_nationality (champions_by_nationality_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, Nationality VARCHAR, Non-major wins INT, Non-major winners INT, Major wins INT, Major winners INT, Total wins INT, Total winners INT, First title INT, Last title INT) CREATE TABLE groupe_a (groupe_a_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Club VARCHAR, Points INT, Played INT, Victories INT, Draws INT, Defeats INT, Goals for INT, Goals against INT, Goal average INT) CREATE TABLE race_3_results (race_3_results_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Team VARCHAR, Laps INT, Grid INT, Points INT)  
SELECT Candidates FROM  WHERE Incumbent = James P. Buchanan